'use strict'


class IdCardNoUtil {

  static getInstance(){
    if(!IdCardNoUtil.instance){
      IdCardNoUtil.instance = new IdCardNoUtil();
    }
    return IdCardNoUtil.instance;
  }


  constructor(){
    this.provinceAndCitys = {11:"北京",12:"天津",13:"河北",14:"山西",15:"内蒙古",21:"辽宁",22:"吉林",23:"黑龙江",
        31:"上海",32:"江苏",33:"浙江",34:"安徽",35:"福建",36:"江西",37:"山东",41:"河南",42:"湖北",43:"湖南",44:"广东",
        45:"广西",46:"海南",50:"重庆",51:"四川",52:"贵州",53:"云南",54:"西藏",61:"陕西",62:"甘肃",63:"青海",64:"宁夏",
        65:"新疆",71:"台湾",81:"香港",82:"澳门",91:"国外"};
    /*每位加权因子*/
    this.powers = ["7","9","10","5","8","4","2","1","6","3","7","9","10","5","8","4","2"];

    /*第18位校检码*/
    this.parityBit =  ["1","0","X","9","8","7","6","5","4","3","2"];

    /*性别*/
    this.genders = {male:"M",female:"F"};

  }

  /**
   * 校验地址码
   * @param  {[type]} addressCode [description]
   * @return {[type]}             [description]
   */
  checkAddressCode(addressCode){
    var check = /^[1-9]\d{5}$/.test(addressCode);
    if(!check) return false;
    if(this.provinceAndCitys[parseInt(addressCode.substring(0,2))]){
        return true;
    }else{
        return false;
    }
  }

  /**
   * 校验日期码
   * @param  {[type]} birDayCode [description]
   * @return {[type]}            [description]
   */
  checkBirthDayCode(birDayCode){
    var check = /^[1-9]\d{3}((0[1-9])|(1[0-2]))((0[1-9])|([1-2][0-9])|(3[0-1]))$/.test(birDayCode);
    if(!check) return false;
    var yyyy = parseInt(birDayCode.substring(0,4),10);
    var mm = parseInt(birDayCode.substring(4,6),10);
    var dd = parseInt(birDayCode.substring(6),10);
    var xdata = new Date(yyyy,mm-1,dd);
    if(xdata > new Date()){
        return false;//生日不能大于当前日期
    }else if ( ( xdata.getFullYear() == yyyy ) && ( xdata.getMonth () == mm - 1 ) && ( xdata.getDate() == dd ) ){
        return true;
    }else{
        return false;
    }
  }

  /**
   * [计算校检码]
   * @param  {[type]} idCardNo [description]
   * @return {[type]}          [description]
   */
  getParityBit(idCardNo){
    var id17 = idCardNo.substring(0,17);
    /*加权 */
    var power = 0;
    for(var i=0;i<17;i++){
        power += parseInt(id17.charAt(i),10) * parseInt(this.powers[i]);
    }
    /*取模*/
    var mod = power % 11;
    return this.parityBit[mod];
  }

  /**
   * 验证校检码
   * @param  {[type]} idCardNo [description]
   * @return {[type]}          [description]
   */
  checkParityBit(idCardNo){
    var parityBit = idCardNo.charAt(17).toUpperCase();
    if(this.getParityBit(idCardNo) == parityBit){
        return true;
    }else{
        return false;
    }
  }

  /**
   * 校验15位或18位的身份证号码
   * @param  {[type]} idCardNo [description]
   * @return {[type]}          [description]
   */
  checkIdCardNo(idCardNo){
    //15位和18位身份证号码的基本校验
    var check = /^\d{15}|(\d{17}(\d|x|X))$/.test(idCardNo);
    if(!check) return false;
    //判断长度为15位或18位
    if(idCardNo.length==15){
        return this.check15IdCardNo(idCardNo);
    }else if(idCardNo.length==18){
        return this.check18IdCardNo(idCardNo);
    }else{
        return false;
    }
  }

  /**
   * 校验15位的身份证号码
   * @param  {[type]} idCardNo [description]
   * @return {[type]}          [description]
   */
  check15IdCardNo(idCardNo){
    //15位身份证号码的基本校验
    var check = /^[1-9]\d{7}((0[1-9])|(1[0-2]))((0[1-9])|([1-2][0-9])|(3[0-1]))\d{3}$/.test(idCardNo);
    if(!check) return false;
    //校验地址码
    var addressCode = idCardNo.substring(0,6);
    check = this.checkAddressCode(addressCode);
    if(!check) return false;
    var birDayCode = '19' + idCardNo.substring(6,12);
    //校验日期码
    check = addressCode.checkBirthDayCode(birDayCode);
    if(!check) return false;
    //验证校检码
    return addressCode.checkParityBit(idCardNo);
  }


  /**
   * 校验18位的身份证号码
   * @param  {[type]} idCardNo [description]
   * @return {[type]}          [description]
   */
  check18IdCardNo(idCardNo){
    //18位身份证号码的基本格式校验
    var check = /^[1-9]\d{5}[1-9]\d{3}((0[1-9])|(1[0-2]))((0[1-9])|([1-2][0-9])|(3[0-1]))\d{3}(\d|x|X)$/.test(idCardNo);
    if(!check) return false;
    //校验地址码
    var addressCode = idCardNo.substring(0,6);
    check = this.checkAddressCode(addressCode);
    if(!check) return false;
    //校验日期码
    var birDayCode = idCardNo.substring(6,14);
    check = this.checkBirthDayCode(birDayCode);
    if(!check) return false;
    //验证校检码
    return this.checkParityBit(idCardNo);
  }


  formateDateCN(day){
    var yyyy =day.substring(0,4);
    var mm = day.substring(4,6);
    var dd = day.substring(6);
    return yyyy + '-' + mm +'-' + dd;
  }

  /**
   * 获取信息
   * @param  {[type]} idCardNo [description]
   * @return {[type]}          [description]
   */
  getIdCardInfo(idCardNo){
    var idCardInfo = {
        gender:"",  //性别
        birthday:"" // 出生日期(yyyy-mm-dd)
    };
    if(idCardNo.length==15){
        var aday = '19' + idCardNo.substring(6,12);
        idCardInfo.birthday=this.formateDateCN(aday);
        if(parseInt(idCardNo.charAt(14))%2==0){
            idCardInfo.gender=this.genders.female;
        }else{
            idCardInfo.gender=this.genders.male;
        }
    }else if(idCardNo.length==18){
        var aday = idCardNo.substring(6,14);
        idCardInfo.birthday=this.formateDateCN(aday);
        if(parseInt(idCardNo.charAt(16))%2==0){
            idCardInfo.gender=this.genders.female;
        }else{
            idCardInfo.gender=this.genders.male;
        }

    }
    return idCardInfo;
  }

  /**
   * 18位转15位
   * @param  {[type]} idCardNo [description]
   * @return {[type]}          [description]
   */
  getId15(idCardNo){
    if(idCardNo.length==15){
        return idCardNo;
    }else if(idCardNo.length==18){
        return idCardNo.substring(0,6) + idCardNo.substring(8,17);
    }else{
        return null;
    }
  }

  /**
   * 15位转18位
   * @param  {[type]} idCardNo [description]
   * @return {[type]}          [description]
   */
  getId18(idCardNo){
    if(idCardNo.length==15){
        var id17 = idCardNo.substring(0,6) + '19' + idCardNo.substring(6);
        var parityBit = this.getParityBit(id17);
        return id17 + parityBit;
    }else if(idCardNo.length==18){
        return idCardNo;
    }else{
        return null;
    }
  }




  

}

module.exports = IdCardNoUtil.getInstance();